Oscillating sieve



April 9, 1935. H. SCHIEFERSTEIN EI'AL 1,997,499

OSCILLATING SIEVE Filed May 25, 1931 a PatenteJA nQ, 1935 Q 1,997,499,

' siEvE Heinrich h eferstc n Bcr niiangi .;G d

- Linke, Magdeburg,1 Germany, assignors to the r ,firm. Fried.. Krupp Grusonwerk' ,Aktiengesellschaft,'Magdebur zBuckau, Germany i a In Germany M -30.2.1930; 1 4'C1aims- (crew-3 The present invention relates to oscillating or preferably be prevented, by a central guide rod, vibrating sieves having two sieve boxes vibrating from lateral deflection, as otherwise, above a synchronously or approximately synchronously, certain length, it could easily bend outwardly, but displaced in phase by about 180 with respect which would prejudicially affect the rocking of to each other, the chief object being, in a sieve the sieve boxes. i l i p M r V U of this nature, to secure a satisfactory sifting The actuation of the vibrating system is effect-j action. i l ed in known manner by a yieldable kinetic cou- According to the invention the vibrating syspling such as an unbalanced pendulum, coupling tem is constituted by two vibrating boxes moving springs or eccentric flyweight. This coupling acts i l0 synchronously or approximately synchronously to store-the kinetic energy imparted to it, and by" r and with a phase displacement of about 180 with a yielding movement thereof, in turn, imparts the respect to each other, wherein one box is conenergy stored therein to the vibrating system. nected through a kinetic coupling adapted to -In thepresent case, a motor l3', by means of a store kinetic energy with a source of power and crank or eccentric l4 and a rod [5 serves to rock.

ing frame, while the other box is connected, on 5, the other end of the lever carrying a weight IT. the one hand. by means o a p tial esilient Theoscillations imparted by thisarrangement. to coupling with the first-named box and, on the the lower box 5.' are transmitted to the upper box other hand, also resiliently with the frame. I 4 by theelastic means operating as apotential' The invention is shownin the accompanying coupling betweenthe two sieve boxes. Ihe dimen- 20 40 and the supporting'plates 1 and 8. These beardrawing, which is a side view of one form'of sions of any coupling and the number of oscilsieve in accordance therewith. lations per minute Iare'so chosen that, the two On a stationary frame I, there are carried two sieve boxes work in resonance or approximate superposed sieve boxes 4 and 5, capable of rockresonance to each other, that is, displaced in phase I ing on suspension hangers 2 and 3 arranged at by about 180. Thus, the varying forces develan angle inclined from the-vertical direction. oped inthe vibrating masses equalize each other The a e 2 0f the b 4 and the hangers 3 of in consequence of the generation of, the forces j the box ,5 are made of equal length a d are a from the centres of gravity and their impingeranged parallel to each other. The sieve boxes am; at, these points, andalso by reason of the are'connected together by elastic means arranged arrangement. of-the elastic medium at right ant the e w in the eXamplG w are gles to the suspension hangers. In particular, formed y p placed a right angles to the. no'free moment tending to a rotation of the whole suspension hangers. A pair of springs 6 is fitted i ur i l on ac si of the boxes between two support In order to avoid unsymmetrical oscillations ing plates 7 and respectively fixedupvn the such as might arise owing to the action of the boxes 4 and 5, on lines passing throughthe center earths gravitational fi ld prings gga t g of gmwty of i Also on each slde of the sitely to such field are provided in known man boxes, a second pair of spring fi is arranged nor between the sieve boxes and the supporting tween bearing members 10 fixed on the frame I frame V ing members are connected together by tie rods W1t1.mut m any i i 3: essince H, so that the varying forces occurring between mvenimm counter'welgh m EP 9 9 A the bearing members, in particular the outward the Slave boxfes; number 9 oscmatmg thrusts simultaneously imparted to the springs 9, systems described mlght be combmed togetherare transmitted to a self contained unit. The What We claim is! supporting frame, the natural vibration of which 1. A vibrating Sieve sy e mp i Vioften acts very detrimentally, is thus free from brating sieve box stat y and rigid S P- any inducement to such natural vibration. On porting frame for said sieve boxes, driving means each side the springs 6 are separated from each for said. system, a kinetic coupling between said other by an intermediate member 12, capable of driving means and d s v x s. a p 50 longitudinal displacement on the tie rods I I and tential coupling between said two sieve boxes, po-, serving as a retaining and guiding member for tential couplings between each of said sieve boxes the springs. Instead of a pair of springs,a sinand said supporting frame, all said potential gle spring may be provided, omitting the intercouplings being coaxially arranged and passing mediate member I2. This spring would then through the centers of gravity of said sieve boxes.

also in a resilient manner with a rigid supporta double-armed lever I6 jointed to the sieve box 15 frame, tie rods'between said bearing plates, all I said potential couplings being coaxially arranged 2.. A vibrating sieve system comprising two vibrating sieve'boxes, a stationary and rigid supporting frame for said sieve boxes, driving means for's aid system, a kinetic coupling between said drivingmeans and one of said sieve boxes, a potential coupling between said two sieve boxes, potential couplings between each of, the sieveboxes and bearing plates fi'xed'upon said supporting and passing through the centers of gravity of said sieve boxes. g

3. A double-mass vibrating-sieve system comprising a stationary and rigid supporting frame, twoseparate vibrating sieve boxes independently supported by said frame, driving'means for said system, a yieldable connection between said riming means and one of said sieve boxes constituting the sole actuating means for said one sieve box,

and a resilient connection directly positioned between said'two sieve boxes constituting the sole actuating means for the other sieve box.

4; A double-mass vibrating sieve system comprising a stationary and rigid supporting frame, two separate vibrating sieve boxes independently supported by said frame, driving means for said system, a yieldable connection between said driving means and one of said sieve boxes constituting the sole actuating means for said one sieve box, a resilient connection directly positioned between said two sieve boxes constituting the sole actuating means for the other sieve box, andresilient connections between each of said sieve boxes and said supporting frame.

' HEINRICH SCHIEFERSTEIN.

GERHARD LINKE. 

